Delete IBusEngineServiceImpl which is no longer used for production.

chromeos/dbus/ibus/ibus_engine_service.h

Index: chromeos/dbus/ibus/ibus_engine_service.h
diff --git a/chromeos/dbus/ibus/ibus_engine_service.h b/chromeos/dbus/ibus/ibus_engine_service.h
index 4913f4cdf26ccf16499bb3ff86344de55b91d078..b699301fc6c0ae237261b9b719228e9fb467d73b 100644
--- a/chromeos/dbus/ibus/ibus_engine_service.h
+++ b/chromeos/dbus/ibus/ibus_engine_service.h
@@ -13,11 +13,6 @@
 #include "chromeos/dbus/dbus_client_implementation_type.h"
 #include "chromeos/dbus/ibus/ibus_constants.h"
 
-namespace dbus {
-class Bus;
-class ObjectPath;
-}  // namespace dbus
-
 namespace chromeos {
 
 class IBusLookupTable;
@@ -76,10 +71,7 @@ class CHROMEOS_EXPORT IBusEngineService {
 
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via DBusThreadManager::Get().
-  static CHROMEOS_EXPORT IBusEngineService* Create(
-      DBusClientImplementationType type,
-      dbus::Bus* bus,
-      const dbus::ObjectPath& object_path);
+  static CHROMEOS_EXPORT IBusEngineService* Create();
 
  protected:
   // Create() should be used instead.